单分子膜系统中二维生长过程的研究

当处于气液界面的类脂类化合物的单分子膜被压缩时,随着分子间距的缩小,单分子膜将经历一系列相变过程.通过荧光显微术可以观测到新相的成核和生长过程.由于单分子膜的二维特性,该系统中的实验观测对于检验和发展二维界面生长理论尤为重要.本文总结了近年来本课题组与相关单位合作,在单分子膜系统中发现的实验现象以及对其生长机制的系列研究.内容包括对单分子膜系统中的成核、界面稳定性、枝晶生长、形态演变等的观测和分析.

Two Dimensional Crystallization in Lipid Monolayers

By compressing a monolayer film,the coexistence of liquid condensed (LC) and liquid expanded (LE) phases can be reached.The transition from LE to LC is usually regarded as a first-order one,so the theory of crystallization can be applied.In this article we review our recent studies on the growth of LC domains in the LE-LC coexistence region driven by the illumination of a fluorescent microscope.The mechanism of this unusual 2D domain growth phenomenon is discussed.The formation of faceted, dendritic and fractal-like domains as well as the evolution and the transition of these patterns are investigated.